The impact of floods and storms on the acoustic reflectivity of the inner continental shelf: A modeling assessment
Lincoln F. Pratson, E. W. H. Hutton, A.J. Kettner, J.P.M. Syvitski, P.S. Hill, D.A. George, T.G. Milligan
2007, Continental Shelf Research (27) 542-559
Flood deposition and storm reworking of sediments on the inner shelf can change the mixture of grain sizes on the seabed and thus its porosity, bulk density, bulk compressional velocity and reflectivity. Whether these changes are significant enough to be detectable by...
Effects of nutrient enrichment on Prymnesium parvum population dynamics and toxicity: Results from field experiments, Lake Possum Kingdom, USA
D. L. Roelke, R.M. Errera, R. Kiesling, B.W. Brooks, J. P. Grover, L. Schwierzke, F. Urena-Boeck, J. Baker, J.L. Pinckney
2007, Aquatic Microbial Ecology (46) 125-140
Large fish kills associated with toxic populations of the haptophyte Prymnesium parvum occur worldwide. In the past 5 yr, incidences of P. parvum blooms in inland water bodies of Texas (USA) have increased dramatically, where cell densities in excess of 1 × 107 cells l–1 are typically observed. We conducted field experiments (Lake Possum Kingdom) during...
Generation of fine hydromagmatic ash by growth and disintegration of glassy rinds
Larry G. Mastin
2007, Journal of Geophysical Research B: Solid Earth (112)
The deposits of mafic hydromagmatic eruptions are more fine grained and variable in vesicularity than dry magmatic deposits. Blocky, equant shapes of many hydromagmatic clasts also contrast with droplet, thread, and bubble wall morphology of dry magmatic fragments. Small (<∼180 μm), blocky hydromagmatic pyroclasts have traditionally been interpreted to result from...
Advantages of wet work for near-surface seismic reflection
R. D. Miller, R.D. Markiewicz, T.R. Rademacker, R. Hopkins, R.J. Rawcliffe, J. Paquin
2007, Conference Paper, SEG Technical Program Expanded Abstracts
Benefits of shallow water settings (0.1 to 0.5 m) are pronounced on shallow, high-resolution seismic reflection images and, for examples discussed here, range from an order of magnitude increased signal-to-noise ratio to resolution potential elevated by more than 8 times. Overall data quality of high-resolution seismic reflection data at three...
Population-scale movement of coastal cutthroat trout in a naturally isolated stream network
R. E. Gresswell, S.R. Hendricks
2007, Transactions of the American Fisheries Society (136) 238-253
To identify population‐scale patterns of movement, coastal cutthroat trout Oncorhynchus clarkii clarkii tagged and marked (35 radio‐tagged, 749 passive integrated transponder [PIT]‐tagged, and 3,025 fin‐clipped) were monitored from June 1999 to August 2000. The study watershed, located in western Oregon, was above a natural barrier to upstream movement. Emigration...
Evaluation and comparison of gross primary production estimates for the Northern Great Plains grasslands
Li Zhang, Bruce K. Wylie, Thomas R. Loveland, Eugene A. Fosnight, Larry L. Tieszen, Lei Ji, Tagir Gilmanov
2007, Remote Sensing of Environment (106) 173-189
Two spatially-explicit estimates of gross primary production (GPP) are available for the Northern Great Plains. An empirical piecewise regression (PWR) GPP model was developed from flux tower measurements to map carbon flux across the region. The Moderate Resolution Imaging Spectrometer (MODIS) GPP model is a process-based model that uses...
Physical and temporal isolation of mountain headwater streams in the western Mojave Desert, Southern California
J. A. Izbicki
2007, Journal of the American Water Resources Association (43) 26-40
Streams draining mountain headwater areas of the western Mojave Desert are commonly physically isolated from downstream hydrologic systems such as springs, playa lakes, wetlands, or larger streams and rivers by stream reaches that are dry much of the time. The physical isolation of surface flow in these streams may be...
Sand deposition in shoreline eddies along five Wild and Scenic Rivers, Idaho
E.D. Andrews, K.R. Vincent
2007, River Research and Applications (23) 7-20
Sand bars deposited along the lateral margin of a river channel are frequently a focus of recreational activities. Sand bars are appealing sites on which to camp, picnic, fish and relax because they are relatively flat, soft, non-cohesive sand, free of vegetation and near the water's edge. The lack of...
Evaluating nephrotoxicity of high-molecular-weight organic compounds in drinking water from lignite aquifers
J.E. Bunnell, C. A. Tatu, H.E. Lerch, W. H. Orem, N. Pavlovic
2007, Journal of Toxicology and Environmental Health, Part A (70) 2089-2091
High-molecular-weight organic compounds such as humic acids and/or fulvic acids that are naturally mobilized from lignite beds into untreated drinking-water supplies were suggested as one possible cause of Balkan endemic nephropathy (BEN) and cancer of the renal pelvis. A lab investigation was undertaken in order to assess the nephrotoxic potential...
Linkages between nutrients and assemblages of macroinvertebrates and fish in wadeable streams: Implication to nutrient criteria development
L. Wang, Dale M. Robertson, P.J. Garrison
2007, Environmental Management (39) 194-212
We sampled 240 wadeable streams across Wisconsin for different forms of phosphorus and nitrogen, and assemblages of macroinvertebrates and fish to (1) examine how macroinvertebrate and fish measures correlated with the nutrients; (2) quantify relationships between key biological measures and nutrient forms to identify potential threshold levels of nutrients to...
Abiotic influences on the biomass of Vallisneria americana Michx. In the Upper Mississippi River
Rebecca M. Kreiling, Y. Yin, D.T. Gerber
2007, River Research and Applications (23) 343-349
American wildcelery, Vallisneria americana Michx. is an ecologically important component of aquatic communities in the Upper Mississippi River (UMR). We conducted a study in 2002 to determine the association of several abiotic factors on the vegetative growth of Vallisneria in Navigation Pool 8 (Pool 8) of the UMR. We measured...
Mass balances of mercury and nitrogen in burned and unburned forested watersheds at Acadia National Park, Maine, USA
S.J. Nelson, K.B. Johnson, J. S. Kahl, T.A. Haines, I.J. Fernandez
2007, Environmental Monitoring and Assessment (126) 69-80
Precipitation and streamwater samples were collected from 16 November 1999 to 17 November 2000 in two watersheds at Acadia National Park, Maine, and analyzed for mercury (Hg) and dissolved inorganic nitrogen (DIN, nitrate plus ammonium). Cadillac Brook watershed burned in a 1947 fire that destroyed vegetation and soil organic matter....
Modeling pesticide fate in a small tidal estuary
A.M. McCarthy, J. D. Bales, W.G. Cope, D. Shea
2007, Ecological Modelling (200) 149-159
The exposure analysis modeling system (EXAMS), a pesticide fate model developed by the U.S. Environmental Protection Agency, was modified to model the fate of the herbicides atrazine and metolachlor in a small tidally dominated estuary (Bath Creek) in North Carolina, USA where freshwater inflow accounts for only 3% of the...
Landslide susceptibility revealed by LIDAR imagery and historical records, Seattle, Washington
W.H. Schulz
2007, Engineering Geology (89) 67-87
Light detection and ranging (LIDAR) data were used to visually map landslides, headscarps, and denuded slopes in Seattle, Washington. Four times more landslides were mapped than by previous efforts that used aerial photographs. The mapped landforms (landslides, headscarps, and denuded slopes) were created by many individual landslides. The spatial distribution...
Comprehensive characterization of atmospheric organic matter in Fresno, California fog water
P. Herckes, J.A. Leenheer, J.L. Collett Jr.
2007, Environmental Science & Technology (41) 393-399
Fogwater collected during winter in Fresno (CA) was characterized by isolating several distinct fractions and characterizing them by infrared and nuclear magnetic resonance (NMR) spectroscopy. More than 80% of the organic matter in the fogwater was recovered and characterized. The most abundant isolated fractions were those comprised of volatile acids...
Flocculation, heavy metals (Cu, Pb, Zn) and the sand-mud transition on the Adriatic continental shelf, Italy
D.A. George, P.S. Hill, T.G. Milligan
2007, Continental Shelf Research (27) 475-488
Across a limited depth range (5-10 m) on many continental shelves, the dominant sediment size changes from sand to mud. This important boundary, called the sand-mud transition (SMT), separates distinct benthic habitats, causes a significant change in acoustic backscatter, represents a key facies change, and delimits more surface-reactive mud from...
Use of streamflow data to estimate base flowground-water recharge for Wisconsin
W.A. Gebert, M.J. Radloff, E.J. Considine, J.L. Kennedy
2007, Journal of the American Water Resources Association (43) 220-236
The average annual base flow/recharge was determined for streamflow-gaging stations throughout Wisconsin by base-flow separation. A map of the State was prepared that shows the average annual base flow for the period 1970-99 for watersheds at 118 gaging stations. Trend analysis was performed on 22 of the 118 streamflow-gaging stations...
Sinter-vein correlations at Buckskin Mountain, National district, Humboldt County, Nevada
P.G. Vikre
2007, Economic Geology (102) 193-224
At Buckskin Mountain (elev 2,650 m, 8,743 ft), Humboldt County, Nevada, a hydrothermal system, imposed on a middle Miocene volcanic sequence with contrasting permeabilities and tensile strengths, produced alteration assemblages controlled by elevation, from Hg-mineralized sinter to subjacent precious metal veins over a vertical distance exceeding 790 m. Sinter and...
Conversations on the habitability of worlds: The importance of volatiles
J.-L. Bertaux, M. Carr, D.J. Des Marais, E. Gaidos
2007, Space Science Reviews (129) 123-165
Our scientific forefathers discuss the interrelationships between water, climate, the atmosphere, and life on Earth and other terrestrial planets at a workshop in Nichtcha??tel, Switzerland. ?? 2007 Springer Science+Business Media B.V....
Global impacts of conversions from natural to agricultural ecosystems on water resources: Quantity versus quality
Bridget R. Scanlon, Ian Jolly, Marios Sophocleous, Lu Zhang
2007, Water Resources Research (43)
Past land use changes have greatly impacted global water resources, with often opposing effects on water quantity and quality. Increases in rain‐fed cropland (460%) and pastureland (560%) during the past 300 years from forest and grasslands decreased evapotranspiration and increased recharge (two orders of magnitude) and streamflow (one order of...
Biodegradation of organic chemicals in soil/water microcosms system: Model development
L. Liu, J.A. Tindall, M.J. Friedel, W. Zhang
2007, Water, Air, & Soil Pollution (178) 131-143
The chemical interactions of hydrophobic organic contaminants with soils and sediments may result in strong binding and slow subsequent release rates that significantly affect remediation rates and endpoints. In order to illustrate the recalcitrance of chemical to degradation on sites, a sorption mechanism of intraparticle sequestration was postulated to operate...
Solar forcing of Gulf of California climate during the past 2000 yr suggested by diatoms and silicoflagellates
John A. Barron, David Bukry
2007, Marine Micropaleontology (62) 115-139
High-resolution records of the past 2000 yr are compared in a north–south transect (28° N to 24° N) of three cores from the eastern slopes of the Guaymas, Carmen, and Pescadero Basins of the Gulf of California (hereafter referred to as the “Gulf”). Evenly-spaced samples from the varved sediments in each...
A field investigation of phreatophyte‐induced fluctuations in the water table
James J. Butler Jr., Gerard J. Kluitenberg, Donald O. Whittemore, Steven P. Loheide II, Wei Jin, Mark A. Billinger, Xiaoyong Zhan
2007, Water Resources Research (43)
Hydrographs from shallow wells in vegetated riparian zones frequently display a distinctive pattern of diurnal water table fluctuations produced by variations in plant water use. A multisite investigation assessed the major controls on these fluctuations and the ecohydrologic insights that can be gleaned from them. Spatial and temporal variations in...
Using multiple gears to assess acoustic detectability and biomass of fish species in lake superior
D.L. Yule, J.V. Adams, J.D. Stockwell, O. T. Gorman
2007, North American Journal of Fisheries Management (27) 106-126
Recent predator demand and prey supply studies suggest that an annual daytime bottom trawl survey of Lake Superior underestimates prey fish biomass. A multiple-gear (acoustics, bottom trawl, and midwater trawl) nighttime survey has been recommended, but before abandoning a long-term daytime survey the effectiveness of night sampling of important prey...
Characterization of the origin of coalbed gases in southeastern Illinois Basin by compound-specific carbon and hydrogen stable isotope ratios
D. Strapoc, Maria Mastalerz, C. Eble, A. Schimmelmann
2007, Organic Geochemistry (38) 267-287
Coalbed gases and waters from exploratory and production gas wells in the southeastern Illinois Basin were sampled to assess geochemically the origin of coalbed gases, with an emphasis on the Springfield and Seelyville Coal Members that are commercially targeted for coalbed methane production in Indiana. On-line analyses of hydrocarbon gases...
